<template>
  <div>
     <!-- 面包屑导航区 -->
      <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <el-card>
        <el-alert
            title="注意：只允许为第三级分类设置相关参数"
            type="warning"
            show-icon>
        </el-alert>
        <!-- 选择商品分类 -->
         <div style="margin-top: 20px;">
            <span>选择商品分类：</span>
            <el-cascader
                v-model="selectedCateKeys"
                :options="CateList"
                :props="cascaderProps"
                @change="handleChange"
                >
            </el-cascader>
        </div>
        <el-tabs v-model="activeName" @tab-click="handleTabClick" >
            <el-tab-pane label="用户管理" name="many">
                <el-button type="primary" size="mini" :disabled="isThirdCate" @click="addDialogVisible = true">添加参数</el-button>
                <!-- 动态参数表格 -->
                 <el-table :data="manyTableData" border stripe>
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{ item }}</el-tag>
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete" @click="deleteParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                 </el-table>
            </el-tab-pane>
            <el-tab-pane label="配置管理" name="only">
                <el-button type="primary" size="mini" :disabled="isThirdCate" @click="addDialogVisible = true">添加属性</el-button>
                <!-- 静态参数表格 -->
                 <el-table :data="onlyTableData" border stripe>
                                        <el-table-column type="expand">
                        <template slot-scope="scope">
                            <el-tag v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">{{ item }}</el-tag>
                            <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                            <el-button type="danger" size="mini" icon="el-icon-delete"  @click="deleteParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                 </el-table>
            </el-tab-pane>
        </el-tabs>
      </el-card>
      <!-- 添加动态参数和静态属性的对话框 -->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @closed="addDialogClosed"
        >
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>

      <!-- 修改动态参数和静态属性的对话框 -->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @closed="editDialogClosed"
        >
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
  </div>
</template>

<script>
export default {
    created() {
        this.getCateList()
        
    },
    data() {
        return {
            CateList:[],
            cascaderProps:{
                expandTrigger: 'hover' ,
                value:'cat_id',
                label:'cat_name',
                children:'children',
           },
           selectedCateKeys:[],
           activeName:'many',
           manyTableData:[],
           onlyTableData:[],
           addDialogVisible:false,
           addForm:{},
           addFormRules:{
            attr_name:[
                { required: true, message: '请输入参数名称', trigger: 'blur' }
            ]
           },
           editDialogVisible:false,
           editForm:{},
           editFormRules:{
                attr_name:[
                { required: true, message: '请输入参数名称', trigger: 'blur' }
            ]
           },
           inputVisible:false,
           inputValue:''
        }
    },
    methods: {
        async getCateList(){
          const{data : res} = await this.$http.get('categories')
          this.CateList = res.data  
        },
        async handleChange(){
            this.getParamsData()
        },
        handleTabClick(){
            this.getParamsData()
        },
        async getParamsData(){
          const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
             params:{sel:this.activeName}
         })
            if(res.meta.status !== 200){
                return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item=>{
              item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
              // 控制文本框的显示与隐藏
              item.inputVisible = false
              // 文本框中输入的值
              item.inputValue = ''
            })
            
            if(this.activeName ==='many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        editDialogClosed(){
             this.$refs.editFormRef.resetFields()
        },
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
                const{data : res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 201){
                    this.$message.error('添加参数失败')
                }
                this.getParamsData()
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
            })
        },
        async showEditDialog(attr_id){
          const{data : res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
            params:{attr_sel:this.activeName}
          })
          if(res.meta.status !== 200){
            this.$message.error('获取参数信息失败！')
          }
            this.editForm = res.data          
            this.editDialogVisible = true
        },
        editParams(){
            this.$refs.editFormRef.validate( async valid=>{
              if(!valid) return 
              
              
              const{data : res} =  await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 200){
                   return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })

        },
        async deleteParams(attr_id){
         const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err=>err)
           
          if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除')
          }
          const{data :res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status !== 200){
               return this.$message.error('删除参数失败')
            }
               this.$message.success('删除成功')
               this.getParamsData()
        },
        // 文本框失去焦点或按下enter会触发
        async handleInputConfirm(row){
          if(row.inputValue.trim().length === 0){
              row.inputValue = ''
              row.inputVisible = false
              return
          }
          row.attr_vals.push(row.inputValue.trim())
          row.inputValue = ''
          row.inputVisible = false

          this.saveAttrVals(row)
        },
        showInput(row){
                row.inputVisible = true
                // $nextTick作用：当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        async saveAttrVals(row){         
           const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,
            attr_vals:row.attr_vals.join(' '),
            attr_sel:row.attr_sel
          })
          if(res.meta.status !== 200){
            return this.$message.error('修改失败')
          }
           this.$message.success('修改参数项成功')

        },
        handleClose(index,row){
            row.attr_vals.splice(index,1)
            this.saveAttrVals(row)

        }
    },
    computed:{
        isThirdCate(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText(){
            if(this.activeName ==='many'){
                return '动态参数'
            }
            return '静态属性'
        },

    }


}
</script>

<style lang="less" scoped>
.el-tabs{
    margin-top: 20px;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}

</style>